23505140231 has 4 divisors (see below), whose sum is σ = 23662893000. Its totient is φ = 23347387464.

The previous prime is 23505140221. The next prime is 23505140251. The reversal of 23505140231 is 13204150532.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23505140231 - 2⁶ = 23505140167 is a prime.

It is a super-2 number, since 2×23505140231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 23505140231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23505140221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78876161 + ... + 78876458.

It is an arithmetic number, because the mean of its divisors is an integer number (5915723250).

Almost surely, 2^23505140231 is an apocalyptic number.

23505140231 is a deficient number, since it is larger than the sum of its proper divisors (157752769).

23505140231 is a wasteful number, since it uses less digits than its factorization.

23505140231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157752768.

The product of its (nonzero) digits is 3600, while the sum is 26.

Adding to 23505140231 its reverse (13204150532), we get a palindrome (36709290763).

The spelling of 23505140231 in words is "twenty-three billion, five hundred five million, one hundred forty thousand, two hundred thirty-one".